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Structural Isomerism02:34

Structural Isomerism

22.3K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Stereoisomerism02:52

Stereoisomerism

14.3K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

3.5K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
3.5K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

13.4K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
13.4K
Valence Bond Theory02:42

Valence Bond Theory

11.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.5K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

25.1K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Ion-pair coordination driven stimuli-responsive one-dimensional supramolecular helicate.

Sourenjit Naskar1, Chumki Dalal2, Pradyut Ghosh1

  • 1Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700032, India. icpg@iacs.res.in.

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Summary

Researchers created a novel 1D smart supramolecular helical assembly using an ion-pair. This structure exhibits thermo- and chemo-responsive transformations, demonstrating dynamic self-assembly capabilities.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Development of novel smart materials with dynamic self-assembly properties is crucial.
  • Coordination-driven self-assembly offers a versatile route to complex architectures.

Purpose of the Study:

  • To synthesize a new heteroditopic ligand for creating smart supramolecular assemblies.
  • To investigate the formation and responsive behavior of a one-dimensional (1D) helical superstructure.

Main Methods:

  • Synthesis of a novel heteroditopic ligand.
  • Characterization of the resulting supramolecular assembly using analytical techniques.
  • Investigation of thermo- and chemo-responsive properties.

Main Results:

  • Successful formation of a 1D smart supramolecular helical assembly driven by ion-pair coordination (Fe2+ and [Cl2(H2O)2]2-).
  • Demonstration of thermo- and chemo-responsive transformation, including disassembly and reassembly of the helical superstructure.

Conclusions:

  • The new ligand facilitates the formation of a dynamic 1D helical supramolecular system.
  • The demonstrated responsiveness highlights the potential of this system for smart material applications.